It is not just the parts for the F-14 that are a problem. The F-14 relied on a sophisticated automatic test station called VAST to ensure the operation, testing and repair of the aircraft’s electronic systems were performed correctly.
Iranian F-14s from 2006 & 2007
http://www.airliners.net/open.file/1310929/L/
http://www.airliners.net/open.file/1304532/L/